Blowpipe for burning gas mixtures.



' G. E. ROBERTS & J. a. SULLIVAN.

BLOWPIPE FOR BURNING GAS MIXTURES- APPLICATION TILED MAY 8, 1908.

Patented Nov. 17, 1908.

' Q/W" zones To all whom it may concerri. I

; UNIT STATES PATENT OFFICE.

- GEORGE-E; Ro Ea rsAiin JOHN. c. SULLIVAN, or VALLEY-FALLS; RHODEISLAND.

LQWPI'PE For. BURNING GAS IXTURES.

'l aitented Nov. 17, 1908.

Application filed May 8,1908. Serial No. 431,692.

Belt known that'we, GEORGE E. ROBERTS and JOHN" C; SULLIVAN, citizensot-the United st,dltes, 'residing at Valley, Falls, in

' operation of' devices the county of Providence. and State of RhodeIsland, have invented new and useful Improvements in Blowpipes forBurning- Gas Mixtures, of

which the following is a specification. w

This invention relates to a blow pipe for burning a suitablegas-mixture, and relates more particularly to improvements where-byt'hevolume of eitherair or gas can bereadily varied'without. materiallyaffecting the pressure at the orifice .or nozzle of theblow pipe.

. The invention has forone of its objects to improve andsimplify theconstruction and i of this character so as to be comparatively easyandinexpensive to manufacture, readily manipulated, and-composed ofcomparatively few parts. 1

'Another object ofthe invention is the provision of a blow pipeconsisting of a body havinglseparate chambers for theair" and gas inflowand havinga nozzle piece communicating with the gas chamber and intowhich extends a threaded tube that com municat-es with the air "chamberfor delivof air. into the nozzle piece at ermg ajet thereof, there.being a needle valve arranged V in the ,said tube whereby the volume ofgas or. air cairbeindependg ently' regulated.

invention comprises .the tures of construction and-arrangementof partswhich" will Ebemore fully described hereinafter and. s'etforth withparticularity in the claimsappendedhereto."

In the accompanying drawing, which illus trates one embodiment of 1 the"invention, Figure, 1 ,is a central .longitudinal'sectionof .the blowpipe.

. tion of pipes connected Fig. 2 is a side elevation of theair-conducting tube thereoii} Fig. 3 is. a' similar'view of theneedle-controlling valve.

Similar reference characters are employed to designatecorrespondingparts-through out the several views. I

Referring to the drawing, A designates a cast metal or'other body thatis formed with separate inlet passages 1 and 2 that are in ternally.threaded at 3 and 4, for the recepwith a source of gas and air or otherfluid under pressure,,the

ume of gas,

. outlet.

body. being formed with chambers 5 and 6 separated by a partition 7 andcommunicatwith the inlet passages 1- .ing, respectively, and 2. The.outer end of the chamber 5 1S internally threaded at 8 for receivingthe The partition 7 has a threaded opening 12 in which screws anair-conducting tube 13 of smaller diameter and chamber 5, so that gascan freely pass around the said tube to the orifice of the nozzle pieceand th'is tube has one or more openings 14 for communication with theair chamber 6 so that air said tube to the orifice of the nozzle pieceand mix with the gas, and at the same time,

'force the latter from thejnozzle piece- The discharge end of the tube13 is contracted at, 15 and has an orifice 16 alining with the nozzle:orifice 11 so that the jet of air will flow in a straight line out ofthe latter and suck. the gas therewith from all points around the point15 of the tube. This tube is adjustable back and forth to vary thevoland for this purpose, the tube extends out of the chamber 6 at therear through'a plug 18 that has a threaded aperture 17, and on thisprojected end of the tube is a collar or ring 19 adjustable to anyposition and clamped in place by a set screw 20, the periphery of thering being milled so as to aliord a better grip thereon. Thus, byturning the collar or ring in' one direction or the other, the-tube willbe correspondingly turned and moved longitudinally nearer, to or awayfrom thecontracted nozzle portion 10 sofas to .vary the area of gasri'orly milled, and secured to the cap nut is,

a needle valve 22 that is of greater. length than the tube 13 so as toproject tothe forward end of the latter where it is .formed into a point23 that coiiperates with the air orifice of varying the efiectivej By'turning 16 for the purpose outlet area of the said tube.' this cap nut21 while the tube tionary by gripping the ring valve can be'movedlongitudinally to vary the effective air outlet opening. WVhen the isheld statube 13 is adjusted by the turning of'the valve-willv gasvolumeacan ring 19, the position of the needle not be altered so thatthe be changed independently. With a burner than the nozzle piece.

can flow through the On-the rear extremity of the-tube 13'. is threadeda cap nut 21 which is exte- 19, the needle of this character, theproportions of air and gas can be nicely adjusted to produce an in-'tense blue flame of. any desired volume.

From the foregoing description, taken in connection with theaccompanying drawing, the advantages of the construction and of themethod of operation will be readily apparent to those skilled in the artto which the invention a-ppertains, and while we have described theprinciple of operation of the invention, together with the device whichwe now consider to be the best embodiment thereof, we desire to have itunderstood that the device. shown is merely illustrative, and that suchchanges may be niadewlien de sired as are within the scope of theappended claims.

Having thus described the invention, what weclaim is 1. In a blow pipe,the combination of body having separate gas and air chambers and inletpassages communicating therewith,

a partition separating the chambers and havthreaded in the opening ofthe partition eX-' tending into the nozzle piece at one end and out-ofthe body at the opposite end, said tube having an opening communicatingwith the air chamber, a needle valve disposed within the tube forcontrolling the outlet opening of the latter, an adjusting memberclosing and threaded on the outer endof the tube for moving the needlevalve'back and forth, a wheel screwed on the tube between the saidmember and end of the body for movingthe tube back and forth by rotarymovement to vary the effective outlet of the gas and outlet of thenozzle piece, and means for clamping the wheel to the tube.

'2. A blow pipe comprising'a body having separate air and gas chambersdivided by a partition, said partition having a threaded openingextending from one side to the other, a tubular nozzle detachablysecured to the body to communicate with the gas chamber thereof andhaving a frusto-conical discharge end disposed axially in alinement withthe said threaded opening of the partition, a cap nutattached to thebody to close the air chamber and provided with a threaded openingalining with'that of the partition, said body having supply passagescommunicating with the respective chambers, an air -discharging tube ofgreater length, than the length of the nozzle and body combined andprojecting at one end out of the body and having its opposite endcontracted and terminating adjacent the frustoconical end of the nozzle,a continuous screw thread on the tube extending from one end inwardly toan intermediate point for engaging the threaded openings of the nut andpartition for moving the tube longitudinally by a rotary movement, thethreaded portion of the tube having air inlet openings communicatingwith the air chamber, a member threaded on and rigidly secured to theprojecting end of the tube for turning the latter, a needle valvedisposed within thetube and having one end arranged to vary theeffective opening at the said contracted end, a device movably mountedand threaded on the projecting end of the tube and connected with theneedle valve for regulating the latter, said device forming a closurefor the outer end of the tube.

4 3. In a blow pipe, the combination of a single piece body havingseparate air and gas chambers, a nozzle piece on t-he body andcommunicating with the gas chamber and provided with a dischargeorifice, an air tube arranged within the body and extending into thenozzle piece and provided with an opening intermediate its ends forcommunicating with the air chamber, said tube being of greater lengththan the combined length of the body and nozzle piece to project out ofthe rear end of the body, a thread on the tube extending from the outerend to a point adjacentthe middle thereof and engaging the body to moveback and forth by a rotary movement, an adjusting wheel screwed on thesaid thread of the tube and clamped thereto, a nut engaging the threadon the e'x tremity of the tube and closing the outer end of the latter,and a needle valve rigidly-Secured to the nut and extending the fulllength of the tube and having a point cooperating with the dischargeorifice of the latter.

In testimony whereof We aflix our signatures in presence of twowitnesses.

CHARLES C. Rror-mnnson, FARLE J. BURLINGAME.

